A stochastic, hybrid computational fluid dynamics/computational combustion acoustics approach for combustion noise prediction is applied to the PRECCINSTA laboratory scale combustor (prediction and control of combustion instabilities in industrial gas turbines). The numerical method is validated for its ability to accurately reproduce broadband combustion noise levels from measurements. The approach is based on averaged flow field and turbulence statistics from computational fluid dynamics simulations. The three-dimensional fast random particle method for combustion noise prediction is employed for the modelling of time-resolved dynamics of sound sources and sound propagation via linearised Euler equations. A comprehensive analysis of simulated sound source dynamics is carried out in order to contribute to the understanding of combustion noise formation mechanisms. Therefrom gained knowledge can further on be incorporated for the investigation of onset of thermoacoustic phenomena. The method-inherent stochastic Langevin ansatz for the realisation of turbulence related source decay is analysed in terms of reproduction ability of local one- and two-point statistical input and therefore its applicability to complex test cases. Furthermore, input turbulence statistics are varied, in order to investigate the impact of turbulence on the resulting sound pressure spectra for a swirl stabilised, technically premixed combustor.

中文翻译：

---

在PRECCINSTA燃烧器测试案例中对燃烧声源及其动力学进行建模

用于燃烧噪声预测的随机混合计算流体动力学/计算燃烧声学方法已应用于PRECCINSTA实验室规模燃烧器（预测和控制工业燃气轮机中燃烧不稳定性）。数值方法经过验证，能够从测量结果中准确再现宽带燃烧噪声水平。该方法基于来自计算流体动力学模拟的平均流场和湍流统计数据。采用三维快速随机粒子法进行燃烧噪声预测，通过线性欧拉方程对声源和声音传播的时间分辨动力学进行建模。进行了模拟声源动力学的综合分析，以有助于理解燃烧噪声的形成机理。由此获得的知识可以进一步被并入用于研究热声现象的发生。从局部一点和两点统计输入的再现能力及其对复杂测试用例的适用性方面，分析了实现与湍流有关的源衰减的方法固有的Langevin ansatz。此外，输入湍流统计数据是可变的，以便研究湍流对旋流稳定的，技术上预混合的燃烧器产生的声压谱的影响。从局部一点和两点统计输入的再现能力及其对复杂测试用例的适用性方面，分析了实现与湍流有关的源衰减的方法固有的Langevin ansatz。此外，输入湍流统计数据是可变的，以便研究湍流对旋流稳定的，技术上预混合的燃烧器产生的声压谱的影响。从局部一点和两点统计输入的再现能力及其对复杂测试用例的适用性方面，分析了实现与湍流有关的源衰减的方法固有的Langevin ansatz。此外，输入湍流统计数据是可变的，以便研究湍流对旋流稳定的，技术上预混合的燃烧器产生的声压谱的影响。